Re: [Qemu-devel] Monitor and serial output window broken with SDL2

[BALATON Zoltan]

On Tue, 18 Dec 2018, Daniel P. Berrangé wrote:
> On Tue, Dec 18, 2018 at 10:54:06AM +0000, Mark Cave-Ayland wrote:
> > On 17/12/2018 14:56, BALATON Zoltan wrote:
> >
> > > I still have this problem after updating everything on my machine, latest QEMU 
> > > and
> > > SDL 2.0.9 so it's not likely to be a bug in some external component. If I just 
> > > start
> > > qemu-system-ppc (compiled with --disable-gtk) and try to open monitor console 
> > > with
> > > Ctrl-Alt-2 I see QEMU monitor but when I type in this window the serial output 
> > > window
> > > contents flash in this window. At the same time the window that opens for 
> > > Ctrl-Alt-3
> > > which should have the serial output is empty. It looks like an index may be off
> > > somewhere or window contents are not associated with the right window but I 
> > > have no
> > > idea where to look for it. Can you reproduce it now and do you have any idea 
> > > what
> > > could cause this?
> >
> > Are you using Fedora Core 29 at all? I know Howard has been experiencing redraw
> > issues since upgrading from FC 28 to FC 29. A couple of other things to check:
>
> There is no "Fedora Core" since Fedora Core 6, just Fedora :-P
>
> But seriously, I teted on Fedora 29 and didn't see any problem, so there
> must be some more specific scenario that is hurting it.
>
> > 1) Does QEMU 3.0 work correctly? If so, a bisection would help.
> > 2) Are you using an Nvidia graphics card with the nouveau driver?
>
> This second point is a good idea to consider.

How is graphics card relevant for this? I do use NVidia but not nouveau 
but vendor drivers (version 390.87) on Mageia 6 (which is a bit like 
Fedora but may have differences). I have this problem for a while so I 
don't think it's a recent regression. It only seems to affect 
qemu-system-ppc, qemu-system-x86_64 does open serial console all right 
but could be I was using different configure options for these.

With qemu-system-ppc when I press Ctrl-Alt-3 an empty window opens and the 
content that should be in this window appears in the monitor window that 
opens for Ctrl-Alt-2 but behind the normal monitor output, only visible 
when I type in that window. My configure options are:

./configure --disable-gtk --disable-tpm \
--audio-drv-list=alsa \
--target-list=ppc-softmmu \
--disable-libssh2 --disable-libusb --disable-guest-agent \
--enable-debug

Parallel console for Ctrl-Alt-4 seems to work all right but that has no 
content. I'm not sure if it's relevant to have output in the serial 
window. For qemu-system-ppc OpenBIOS has some serial output. Now that I've 
tried it does seem to be relevant: if I press Ctrl-Alt-3 right after QEMU 
starts when the main screen still says "guest has not initialised" then it 
works but if I wait until OpenBIOS starts with yellow screen (and some 
output on serial) and then press Ctrl-Alt-3 then empty window opens so 
maybe it's related to have some content on serial when window first opens?

Regards,
BALATON Zoltan